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SINGLE -DRAIN - 5DX Retro may be used to cover a single suction outlet providing one of the options is followed <br />from ANSI/APSP-7 Section6.3 and Appendix B. See excerpt of options on page 2, <br />DUAL -DRAIN SYSTEM <br />Vacuum Breaker Backup. As with any dual -drain system, one drain is intended to be a vacuum breaker for the <br />other in the unlikely event a swimmer completely blocks one of the SDX RETRO drains. If this were to happeri, the <br />pump is able to safely draw water from the second drain. <br />Dual -Drain Spacing. Most suction safety codes require dual -drains to be installed three feet apart, pipe to pipe <br />however some codes require three feet between drain covers. For this reason, Dual SDX RETRO piping is spaced <br />three (3) feet, ten (10) inches apart <br />Vertical Dual -Drain Installation. The purpose of the vertical dual -drain installation is to make it less likely two <br />people can approach two drains at once. Effectively, the second drain would be at an individual's feet. <br />SDX RETRO Is a circulation drain, not intended to remove debris, SDX Retro is a universal replacement drain cover submerged suction outlet <br />suitable for Single or Multiple Drain use on the well and floor, This is to keep debris and sand from collecting on and around the low velocity SDX <br />RETRO cover. Do not locate suction outlets on seating areas or on the backrest of such seating areas. <br />The maximum flow rate for each SDX REMO drain Is 200 gpm on the floor —192 gpm on the wait This flow rating allows for pumps up to 3 hp <br />to operate efficient For pumps with higher flow rates or systems with multiple pumps on a common manffoid, additional SDX RETRO drains may <br />be added. Do not exceed the maximum allowable flow rate stated on the suction fitting. The velocity at the opening to the SDX drain at the maximum <br />rated flow of 200GPM is 1.485 feet per second. For multiple drain systems where more than two drains are used, the maximum flow rate is <br />calculated per ANSI/APSP-7 Section 4,6 as shown in the following chart <br />DESCRIP iON MAXIMUM SYSTEM ROW FLOOR MAXIMUM SYSTEM FLOW WALL MINIMUM FLOW RATING OF EACH CONEF <br />%MAXIMUM SYSTEM FLOW RATE <br />One SDX Retro High Flow Safety Drain <br />T __ <br />200 gpm (756 Ipm) 192 gpm (726 Ipm) <br />100% <br />Two SDX Retro High Flow Safety Drains <br />200 gpm (756 Ipm) 192 gpm (726 1pm) <br />100% <br />Three SDX Retro High Flow Safety Drains <br />300 gpm (1136 Ipm) 288 gpm (1090 Ipm) <br />667% <br />Four $DX Retro Ii Flow Sdety Drains <br />400 qpm (1514 Ipm) 884 porn 1456 m) <br />50% <br />Pipe size. To design an <br />efficient suction system in <br />accordance with national <br />swimming pool standards, <br />the following pipe sizing <br />guideline should be <br />followed: <br />HEAD LOSS CURVE <br />Table dei from ANSI/APS10-7 Section 4,8 Table I <br />SUCTION PIPE SRE <br />MAX RESIDENTIAL GPM <br />MAX PUBLIC GPM <br />t /2` <br />50 <br />$7 <br />2' <br />62 <br />62 <br />2 /2' <br />117 <br />Be <br />3' <br />181 <br />136 <br />4' <br />313 200 Max GPM) <br />234 200 Max GPM) <br />.p W " 10 as r0 to Ito I" 100 W 100 teo 1M not In no OIG 1;pollao MO lip <br />r GrM <br />For technical assistance can 1.800.621.5885 or contact your regional representative <br />1 <br />